Hi Amy
Thanks for posting on the forums. I see that you posted 3 times in total with the same issue, I have removed the other 2 so that we can focus on helping resolve your issue on this post.
With regard to the driver and ActivInspire software, do you know what version of ActivInspire was installed on your MacBook Air? Launch ActivInspire and click on Help>About and the version will be listed here.
To double check that you have the driver, you should have a ActivManager icon on your taskbar near the date and time.
Which looks similar to 
, it is possible if your pens arent working that there is a red X icon through this. If you do have this, please could you click on this and click on Control Panel. At the bottom of this window will have a driver version. If your ActivBoard is seen listed under "Description" please also provide the firmware.
If you do not have the ActivManager icon, you can download this by going to www.PrometheanKB.com and search for article 10902 and selecting the appropriate version for your MacBook Air.
If you do have the red X appearing on the icon, then please ensure that you have checked all of the cables between the ActivBoard and the Macbook Air and ensure they are plugged in.
If the issue still persists please could you provide the version numbers and also the ActivBoard Product number (Search for article 10474 if you require help identifying this).
Should you wish to contact Promethean Technical Support directly either by phone or via email please quote your reference number which I have created to assist resolving this issue which is 00423373.
Adam
Promethean Technical Support